DISEASE CHARACTERISTICS: Histologically or cytologically confirmed advanced solid tumor refractory to standard treatment or for which no effective standard therapy exists Bladder cancer Breast cancer Colon cancer Esophageal cancer Gastric cancer Non-small cell lung cancer Pancreatic cancer Evaluable or measurable disease B3 antigen present on more than 30% of tumor cells No prior or concurrent CNS metastasis Hormone receptor status: Not specified